ATLANTA — Rep. Jack Kingston of Savannah and former Dollar General CEO David Perdue advanced to a GOP runoff after Tuesday’s Senate primary, setting up a battle between a veteran congressman and an opponent billing himself as an outsider in a race that will help determine which party controls Congress.

Perdue, who had been leading in the polls, and Kingston, who dominated in fundraising, secured their spots with the help of a major TV advertising blitz in the final few weeks and left the state’s sizeable tea party crowd without a favored candidate. In unofficial returns, Perdue had 31 percent of the vote to Kingston’s 26 percent with 90 percent of precincts reporting.

Former Secretary of State Karen Handel, who had tea party support but lagged in fundraising, was headed for third with 22 percent. Reps. Paul Broun of Athens and Phil Gingrey of Marietta were in fourth and fifth, respectively. Earlier, Michelle Nunn easily won the Democratic nomination, defeating her three opponents.

A runoff in Georgia occurs when no candidate receives 50 percent plus one vote.

The primary has been closely watched nationally, with Republicans needing just six seats to claim a majority in the Senate. Nunn is considered a formidable opponent, and Republicans can ill afford to lose the seat left open by retiring Republican Sen. Saxby Chambliss. Although the state has voted reliably Republican in recent years, Democrats see an opening with changing demographics in the state — a growing minority population and residents moving in from out of state.

“I’ve begged you for a year, get me into this general election in November because we will not allow (Senate Majority Leader) Harry Reid to have one more vote in this United States Senate,” Perdue told a cheering crowd of supporters.

Kingston promised an issues-based campaign but also issued a warning to Perdue: “I know my voting record is a matter of public scrutiny, and you will be hearing about it. But I will say to my opponent, so is your business record, and we will be talking about that.”

Perdue, a cousin of former Gov. Sonny Perdue, saw his standing rise in recent weeks due in part to TV ads depicting his four opponents as crying babies who had their chance to fix the nation’s problems. Perdue chipped in at least $2.1 million of his own money to fund his campaign and fended off late attacks on his lengthy business record.

Kingston, who is serving his 11th term, dominated in fundraising throughout the GOP race and drew support from dozens of state and local officials, but his early TV ads appeared to fall flat as he highlighted his personal frugality in an attempt to limit attacks on his history of earmarks. Of the three congressmen, Kingston was considered the strongest and received the backing of the U.S. Chamber of Commerce, which spent nearly $1 million in TV and online ads promoting him as a conservative fighter.

“He needs to send the Chamber of Commerce a really nice present with a really pretty bow,” said veteran GOP strategist Chip Lake, who is not aligned with the campaigns. “Their ad was really solid. It was more in line with how people who support Jack wanted him to market himself from the beginning.”

The chamber issued a statement late Tuesday reiterating its support for Kingston “as the pro-business candidate in this race” and pledged to stay active in the runoff.

Handel also sought to claim the outsider mantle. She built momentum in the final month with the help of a comment by Perdue about her lack of a college degree and endorsements from the likes of former Alaska Gov. Sarah Palin, but her lack of money hurt her ability to match Perdue and Kingston in critical TV advertising.

“We were always the underdog and the little engine that could right from the very beginning,” Handel told supporters Tuesday night.

Perdue’s comment turned off Sant Perez, 55, an Atlanta sales manager for a television station, who initially considered him along with Kingston and Handel. He ultimately voted for Kingston, saying Perdue’s comments made him seem elitist.

“I like Handel, but I think Kingston has a better shot” to beat Nunn because of his experience and more moderate views, Perez said.

On Tuesday evening, Nunn celebrated her victory with a few hundred supporters in a hotel ballroom. Her father, a moderate who represented Georgia in the Senate for years, was among the family members by her side.

“We don’t know who the candidates on the other side are going to be but we know that these candidates are all in the race to extremes,” Nunn said. “They’re more interested in scoring political points than in solving actual problems.”

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